EP3051720B1 - Appareil de transport, système de transport, procédé de transport, et support d'informations sur lequel est mémorisé un programme - Google Patents

Appareil de transport, système de transport, procédé de transport, et support d'informations sur lequel est mémorisé un programme Download PDF

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Publication number
EP3051720B1
EP3051720B1 EP14849592.2A EP14849592A EP3051720B1 EP 3051720 B1 EP3051720 B1 EP 3051720B1 EP 14849592 A EP14849592 A EP 14849592A EP 3051720 B1 EP3051720 B1 EP 3051720B1
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EP
European Patent Office
Prior art keywords
signal
transport
intensity
transmission
station
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EP14849592.2A
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German (de)
English (en)
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EP3051720A4 (fr
EP3051720A1 (fr
Inventor
Takanori Inoue
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NEC Corp
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NEC Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0205—Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0221—Power control, e.g. to keep the total optical power constant
    • H04J14/02212—Power control, e.g. to keep the total optical power constant by addition of a dummy signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0287—Protection in WDM systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07955—Monitoring or measuring power

Definitions

  • a submarine cable system having the OADM (Optical Add/Drop Multiplex) function of freely inserting or removing signals for each light wavelength includes a plurality of paths, which are accommodated in one optical fiber to improve the flexibility of a communication network and thereby relieve the burden of plant and equipment investment.
  • OADM Optical Add/Drop Multiplex
  • the total power of a signal transmitted through cables made of optical fibers is set constant. More specifically, in the submarine cable system having the OADM function, when some wavelength components of a signal are lost upon, for example, cable disconnection, the remaining wavelength components of the signal are amplified to maintain the total power of the signal constant.
  • the optical spectrum changes due to factors such as deterioration of the waveform of the signal related to the nonlinear effects of the optical fibers, thus degrading the transport quality of the signal.
  • the submarine cable system has the OADM Fault Recovery function of, when trouble occurs in any cable, compensating the intensity (power) level of a signal group remaining without a loss, using dummy light to ensure a given communication quality.
  • PTL 1 discloses a technique for compensating the intensity (power) level of a signal (group) in an optical communication system.
  • the optical communication system multiplexes the signal (group) transmitted from the branch station with a dummy signal to compensate the signal (group) from the branch station using dummy light.
  • the compensation allows the signal (group) from the transmitting station and the signal (group) from the branch station to keep nearly the same power level to prevent degradation of the system operating characteristics.
  • PTL 2 discloses a technique for providing dummy light generation/adjusting units in terminal apparatuses (transmitting stations) to compensate the power level of the signal for each terminal apparatus (transmitting station).
  • PTL 2 describes providing each terminal apparatus (transmitting station) with a dummy light generation/adjusting unit which generates dummy light corresponding to a portion suffering optical signal disconnection upon the occurrence of cable disconnection trouble to maintain the channel power of the signal constant.
  • Document US 2003/048508 A1 relates generally to optical communications, and more particularly to a system for maintaining amplifier saturation in a wavelength division multiplexed (WDM) optical communication system.
  • WDM wavelength division multiplexed
  • Document EP 0 910 182 A2 relates generally to wavelength division multiplexing (WDM) using a plurality of optical signals having different wavelengths, and more particularly to an optical transmission device and an optical communication system applied to WDM.
  • WDM wavelength division multiplexing
  • Document EP 0 926 854 A2 relates to a multi-channel communication systems and in particular to methods for equalizing WDM systems.
  • each of a plurality of terminal apparatuses compensates the power level of a signal using dummy light.
  • each of a plurality of terminal apparatuses (transmitting stations) compensates a signal using dummy light, such compensation actions by the plurality of terminal apparatuses (transmitting stations) affect each other in multiplexing and may produce no expected effects.
  • a transport system according to the present invention is also defined in the appended set of claims.
  • optical signals As an example, the present invention is not limited to optical signals and is also applicable to, for example, electrical signals.
  • the transport system for optical signals includes a plurality of transport apparatuses (transmitting stations). This system combines signals from the plurality of transport apparatuses (transmitting stations) and transports the combined signal via transport channels.
  • This system combines signals from the plurality of transport apparatuses (transmitting stations) and transports the combined signal via transport channels.
  • the intensity (power) of a signal to be transmitted from one transport apparatus (transmitting station) changes, this may affect signals to be transmitted from other transport apparatuses (transmitting stations).
  • a signal to be transmitted from one transport apparatus has its intensity (power) lowered by automatic pre-emphasis control in advance and is then transmitted, the intensities (powers) of signals to be transmitted from other transport apparatuses may become high.
  • the transport system includes, for example, transport channels 3 made of optical fibers. Furthermore, the transport system includes an optical repeater 4 which compensates for signal attenuation in the transport channels 3. Further, the transport system includes a branching device 5 which inserts or branches a signal. Furthermore, the transport system moreover includes communication channels 6 for connecting the trunk stations 1 and the branch station 2 to each other.
  • the trunk stations 1 and the branch station 2 serve as, for example, landing stations in a submarine cable system.
  • Each of the trunk stations 1 and the branch station 2 includes transport apparatuses (not illustrated in Fig. 1 ).
  • Each transport apparatus includes, for example, a means for transmitting or receiving a signal and a monitor means for the signal.
  • each of the trunk stations 1 and the branch station 2 exchanges, for example, information required to transmit or receive signals via communication channels 6 (outbound communication channels) provided by lines different from the transport channels 3. It should be noted that each of the trunk stations 1 and the branch station 2 may exchange the information via inbound communication channels provided in the transport channels 3 using an overhead incurred at the trunk stations 1 and the branch station 2. Further, each of the trunk stations 1 and the branch station 2 may exchange the information via redundant communication channels using both outbound and inbound communication channels.
  • the transport channels 3 are made of optical fibers and may be formed by bundling a plurality of optical fibers together.
  • the trunk stations 1 and the branch station 2 transmit or receive signals to or from each other via the transport channels 3.
  • Fig. 2 is a block diagram illustrating an example of signal insertion or branching in the branching device 5.
  • a signal transmitted from the trunk station 1-1 (station A) contains a trunk signal block A and a Drop signal block B, as depicted in Fig. 2 .
  • the branching device 5 transmits the trunk signal block A (that is, does not transmit the Drop signal block B) of a signal transmitted from the trunk station 1-1 (station A) and multiplexes the resultant signal with an Add signal block C transmitted from the branch station 2 (station C). Then, the branching device 5 transmits a signal containing the trunk signal block A and the Add signal block C to the trunk station 1-2 (station B).
  • the branching device 5 for example, further transmits a trunk signal block X of a signal transmitted from the trunk station 1-2 (station B) and multiplexes the resultant signal with an Add signal block Z transmitted from the branch station 2 (station C), as depicted in Fig. 2 . Then, the branching device 5 transmits a signal containing the trunk signal block X and the Add signal block Z to the trunk station 1-1 (station A).
  • Fig. 3 is a block diagram illustrating an exemplary configuration of the trunk station 1 or the branch station 2 according to the first exemplary embodiment of the present invention.
  • the trunk station 1 or the branch station 2 includes a plurality of transport apparatuses 7 and a plurality of optical couplers 8, as depicted in Fig. 3 .
  • the transport apparatus 7 functions as, for example, a means for transmitting or receiving a signal and a monitor means for the signal.
  • the plurality of transport apparatuses 7 may be respectively managed by, for example, different carriers.
  • each of the trunk signal block, the Add signal block, and the Drop signal block is a mixture of signals from the different carriers.
  • a signal transmitted through the transport channel 3 is a mixture of signals generated by different carriers for each wavelength set.
  • the plurality of light transmission/reception units 70 respectively transmit or receive signals having different wavelengths.
  • the light multiplex/demultiplex unit 71 multiplexes signals having different wavelengths and received from the plurality of light transmission/reception units 70 into a multiple-wavelength signal. Further, the light multiplex/demultiplex unit 71 demultiplexes an externally received signal and transmits the resultant signal to each of the plurality of light transmission/reception units.
  • the light multiplex/demultiplex unit 71 includes a light demultiplex unit 714 and a trouble detection unit 715, as illustrated in Fig. 4 .
  • the light demultiplex unit 714 demultiplexes an externally received signal group and respectively transmits the demultiplexed signals to the light transmission/reception units 70.
  • the trouble detection unit 715 monitors the optical spectrum of an externally received signal group to detect the loss of some signals (or a signal subgroup) which constitute the signal group.
  • the trouble detection unit 715 notifies the monitor unit 72 of a loss of signal when it detects that the loss of signal has occurred.
  • Fig. 5 is a view illustrating an exemplary optical spectrum of a signal when no loss of signal occurs.
  • Fig. 5 shows the signal intensity (power) on the ordinate and the signal wavelength on the abscissa.
  • the trunk station 1-2 receives a signal obtained by multiplexing a trunk signal block from the trunk station 1-1 (station A) and an Add signal block from the branch station 2 (station C) when, for example, no loss of signal occurs.
  • the trouble detection unit 715 detects that an Add signal block is lost from the received signal (group) and notifies the monitor unit 72 of a loss of signal.
  • the trouble detection unit 715 notifies the monitor unit 72 of an alarm when, for example, an Add signal block is lost.
  • the trouble detection unit 715 uses, for example, LOW (Loss of Wavelength) as an alarm.
  • an alarm issued when a trunk signal block is lost is defined as LOW(1) and an alarm issued when an Add signal block is lost is defined as LOW(2).
  • the trouble detection unit 715 of the trunk station 1-2 since an Add signal block is lost, the trouble detection unit 715 of the trunk station 1-2 (station B) notifies the monitor unit 72 of only LOW(2) as an alarm.
  • two types of LOW alarms namely, LOW(1) and LOW(2) are used. As the number of branch stations 2 increases, the number of types of LOW alarms also increases.
  • an alarm issued when a trunk signal block is lost is defined as LOW(1) and an alarm issued when an Add signal block is lost is defined as LOW(2)
  • the correspondence between the signal block and LOW is not limited to this and is defined for each landing station (that is, each of the trunk stations 1 and the branch station 2).
  • the monitor unit 72 of the transport apparatus 7 notifies an opposed transport apparatus 7 of information concerning the reception quality of a received signal, in response to a LOW alarm from the trouble detection unit 715.
  • the information concerning the reception quality is stored in, for example, the header portion of a signal to be transmitted to the opposed transport apparatus 7.
  • the monitor unit 72 of the transport apparatus 7 may notify an opposed transport apparatus 7 of the reception quality of a received signal and request this transport apparatus 7 to execute automatic pre-emphasis control, in response to a LOW alarm from the trouble detection unit 715.
  • the transport apparatus 7 on the receiving side may request the transport apparatus 7 on the transmitting side to execute automatic pre-emphasis control, upon detection of trouble having occurred in the transport channel 3.
  • the trouble detection unit 715 can detect that trouble has occurred in the transport channel 3 in the direction from the trunk station 1-2 (station B) to the trunk station 1-1 (station A), the trouble detection unit 715 may request the transmitting side to execute compensation of a signal to be transmitted (automatic pre-emphasis control).
  • Fig. 7 is a block diagram illustrating configurations necessary for explaining automatic pre-emphasis control and extracted from the exemplary configuration of the transport system according to the first exemplary embodiment of the present invention.
  • Fig. 7 illustrates an exemplary case where the transmitting side is the trunk station 1-1 (station A) and the receiving side is the trunk station 1-2 (station B).
  • the trunk station 1-1 (station A) transmits a signal and the trunk station 1-2 (station B) receives the signal.
  • the trunk station 1-2 (station B) Upon receiving the signal, the trunk station 1-2 (station B) notifies the trunk station 1-1 (station A) of information concerning the reception quality when the signal is received.
  • the trunk station 1-1 (station A) adjusts the intensity (power) of a signal to be transmitted, based on the reception quality notified by the trunk station 1-2 (station B). It should be noted that the trunk station 1-2 (station B) notifies the trunk station 1-1 (station A) of the reception quality of the signal via the communication channels 6 (outbound). The trunk station 1-2 (station B) may notify the trunk station 1-1 (station A) of the reception quality of the signal via the transport channels 3 (inbound).
  • automatic pre-emphasis control is executed to lower the intensity (power) of a trunk signal block in advance, thereby suppressing amplification of the intensities (powers) of wavelength components of the trunk signal block.
  • the monitor unit 72 of the transport apparatus 7 at the trunk station (station A) monitors each of the plurality of light transmission/reception units 70.
  • the monitor unit 72 requests each of the plurality of light transmission/reception units 70 to send information concerning the reception quality at an opposed trunk station (station B), for a signal transmitted from each of the plurality of light transmission/reception units 70.
  • Examples of the reception quality include the value of the bit error correction count of a signal received by the trunk station (station B), and the value of the signal intensity (power).
  • the light transmission/reception unit 70 receives the reception quality notification from the light transmission/reception unit 70 of the opposed trunk station 1-2 (station B).
  • the light transmission/reception unit 70 of the opposed trunk station 1-2 (station B) for example, incorporates the information concerning the reception quality into one area of the overhead of a transmission frame to be transmitted to the trunk station 1-1 (station A).
  • the monitor unit 72 receives the value of the reception quality in the light transmission/reception unit 70 of the opposed trunk station 1-2 (station B) from each of the plurality of light transmission/reception units 70 and compares the notified value with a predetermined threshold (S103).
  • the generation unit 711 generates dummy light used to control the signal transmission intensity (power).
  • the combination unit 710 multiplexes the generated dummy light with signals from the plurality of light transmission/reception units 70.
  • the generation unit 711 generates dummy light to maintain the intensity (power) of a signal to be transmitted from the transport apparatus 7 (that is, light obtained by multiplexing together signals from the plurality of light transmission/reception units 70) constant.
  • the information of wavelengths (wavelength ranges) used by the light transmission/reception unit 70 is acquired by, for example, the monitor unit 72.
  • the monitor unit 72 notifies wavelengths (wavelength ranges) used for dummy light, of the generation unit 711.
  • the generation unit 711 may acquire in advance the information of wavelengths (wavelength ranges) used for dummy light.
  • the monitor unit 72 requests the generation unit 711 to start to generate dummy light in response to, for example, a request from an opposed transport apparatus 7. It should be noted that the monitor unit 72 may request the generation unit 711 to stop compensation that uses dummy light, upon, for example, recovery from the trouble in the transport channel 3.
  • Fig. 9 is a flowchart illustrating an exemplary operation of the light multiplex/demultiplex unit 71 of the transport apparatus 7.
  • the trouble detection unit 715 of the light multiplex/demultiplex unit 71 detects that an externally received signal is partially lost (S201). The trouble detection unit 715 then notifies the monitor unit 72 that a loss of signal has occurred.
  • the generation unit 711 Upon receiving a request to stop compensation that uses dummy light from the monitor unit 72 (YES in S205), the generation unit 711 stops the compensation (S206). Meanwhile, if the generation unit 711 receives no such request (NO in S205), the generation unit 711 returns the process to step 203 (S203), in which it continues to compensate the signal using dummy light.
  • each of the plurality of transport apparatuses 7 When trouble occurs in a transport channel 3, each of the plurality of transport apparatuses 7 performs automatic pre-emphasis control for predetermined wavelength components that are lost due to the trouble and compensates them using dummy light to maintain the total power (intensity) of a signal transmitted from this transport apparatus 7 constant.
  • one apparatus delays the start of compensation of a signal using dummy light while other apparatuses execute automatic pre-emphasis control. Then, when other transport apparatuses 7 do not change the intensities of signals to be transmitted, one transport apparatus 7 executes automatic pre-emphasis control and compensation of a signal using dummy light.
  • an opposed transport apparatus 7 can determine that this change results from (2) a loss of signal in the transport channel 3. Therefore, the opposed transport apparatus 7 can request the transport apparatus 7 to execute automatic pre-emphasis control (or continue automatic pre-emphasis control).
  • An exemplary configuration of a transport system according to the second exemplary embodiment of the present invention is the same as in the first exemplary embodiment of the present invention.
  • a transport apparatus 7-1 detects that trouble has occurred in the transport channel 3, it delays compensation of a signal using dummy light by a predetermined first time.
  • the first time is determined in consideration of, for example, the time taken for other transport apparatuses 7 to complete automatic pre-emphasis control.
  • the first time may be determined to delay compensation of a signal using dummy light after such other transport apparatuses 7 complete automatic pre-emphasis control.
  • the monitor device 9 monitors a signal transmitted from the light multiplex/demultiplex unit 71 of each of the plurality of transport apparatuses 7 to detect whether this transport apparatus 7 is performing automatic pre-emphasis control.
  • the monitor device 9 includes, for example, a spectrum analyzer which monitors the spectrum of a signal transmitted from the transport apparatus 7. In this case, the monitor device 9 detects whether at least one of the plurality of transport apparatuses is executing automatic pre-emphasis control, based on the spectrum of the signal transmitted from the corresponding light multiplex/demultiplex unit 71.
  • each of the plurality of transport apparatuses 7 does not start automatic pre-emphasis control and compensation of a signal using dummy light, unless the monitor device 9 gives permission. Then, while any of the plurality of transport apparatuses 7 performs automatic pre-emphasis control, the monitor device 9 does not permit other transport apparatuses 7 to perform automatic pre-emphasis control and compensation of signals using dummy light beams.
  • one apparatus delays the start of compensation of a signal using dummy light while other apparatuses execute automatic pre-emphasis control. Then, when other transport apparatuses 7 do not change the intensities of signals to be transmitted, one transport apparatus 7 executes automatic pre-emphasis control and compensation of a signal using dummy light.
  • an opposed transport apparatus 7 can determine that this change results from a loss of signal in the transport channel 3. Therefore, the opposed transport apparatus 7 can request the transport apparatus 7 to execute automatic pre-emphasis control (or continue automatic pre-emphasis control).
  • a transport apparatus 7 detects that trouble has occurred in the transport channel 3 (S301).
  • the transport apparatus 7 requests an opposed transport apparatus 7 to compensate the signal using dummy light, upon the elapse of the predetermined time (S303).
  • the transport apparatus 7 further requests the opposed transport apparatus 7 to execute automatic pre-emphasis control (control of the power of a signal to be transmitted, based on the reception quality), upon the elapse of a predetermined time (S304).
  • the transport apparatus 7 When, for example, the reception quality of a received signal is recovered, the transport apparatus 7 requests the opposed transport apparatus 7 to stop (end) compensation of a signal using dummy light (S305). Further, when, for example, the reception quality of a received signal is recovered, the transport apparatus 7 requests the opposed transport apparatus 7 to stop (end) automatic pre-emphasis control (S306). Upon receiving the requests, the opposed transport apparatus 7 maintains the states of automatic pre-emphasis control and compensation of signals using dummy signals having been executed until that moment.
  • the opposed transport apparatus 7 may execute a process for restoring the output setting of dummy light and the output setting of a signal to be transmitted to the state before the occurrence of trouble is detected, when recovery from the trouble in the transport channel is performed because of, for example, the completion of cable repair.
  • This process is called restoration, which includes (1) a method for operating, for example, a monitor device 9 shown in Fig. 10 to restore the setting of a light multiplex/demultiplex unit 71 of the transport apparatus 7 or the like to the state before the occurrence of trouble is detected, and (2) a method for automatically restoring this setting by recovery of LOW (alarm recovery).
  • Each light transmission/reception unit 70 functions as a transponder (TPND), which converts a signal received from, for example, a client apparatus (not illustrated) into a signal suitable for long-range light transmission and sends it. Further, each light transmission/reception unit 70 also functions as a TPND, which branches a signal to be sent to a client apparatus based on a received signal and passes the resultant signal to the client apparatus.
  • TPND transponder
  • step 301 (S301) of Fig. 11 the light multiplex/demultiplex unit 71 of the transport apparatus 7 detects that trouble has occurred in the transport channel 3.
  • the trouble detection unit 715 of the transport apparatus 7 notifies the monitor unit 72 of a LOW (Loss of Wavelength) alarm upon detection of the occurrence of the trouble.
  • the monitor unit 72 can specify the light transmission/reception unit 70 targeted for automatic pre-emphasis control (in the opposed transport apparatus 7), in accordance with the type of notified LOW.
  • the monitor unit 72 of the trunk station 1-1 determines, as a target for automatic pre-emphasis control, the light transmission/reception unit 70 that outputs a signal from the opposed trunk station 1-2 (station B) to the apparatus of its own (trunk station 1-1 (station A)).
  • the trunk station 1-1 (station A) can determine that it is necessary to control the power of a signal to be transmitted from the light transmission/reception unit 70 that transmits a signal to the apparatus of its own (trunk station 1-1 (station A)), at the trunk station 1-2 (station B).
  • the transport apparatus 7 requests the specified light transmission/reception unit 70 to execute automatic pre-emphasis control via, for example, communication channels 6 (outbound communication channels).
  • Fig. 12 is a table representing the correspondence between a combination of LOW alarms received by the monitor unit 72 of the trunk station 1-1 (station A) and a landing station that requires automatic pre-emphasis control (that is, the trunk station 1 and the branch station 2).
  • the monitor unit 72 of the trunk station 1-1 (station A) receives LOW(2), it can be determined that automatic pre-emphasis control is necessary for the light transmission/reception unit 70 that transmits a signal to the branch station 2 (station C), at the trunk station 1-2 (station B).
  • Fig. 13 is a table representing the correspondence between a combination of LOW alarms received by the monitor unit 72 of the trunk station 1-2 (station B) and a landing station that requires automatic pre-emphasis control (that is, the trunk station 1 and the branch station 2), like Fig. 12 .
  • Fig. 14 is a table representing the correspondence between a combination of LOW alarms received by the monitor unit 72 of the branch station 2 (station C) and a landing station that requires automatic pre-emphasis control (that is, the trunk station 1 and the branch station 2), like Figs. 12 and 13 .
  • Fig. 15 is a flowchart illustrating another exemplary operation of the transport apparatus according to the third exemplary embodiment of the present invention when OADM Fault Recovery is executed. More specifically, Fig. 15 illustrates an exemplary operation of the transport apparatus 7 in response to a request to execute compensation of a signal using dummy light and automatic pre-emphasis control, from the opposed transport apparatus 7.
  • the transport apparatus 7 requests each of the plurality of light transmission/reception units 70 to send the notification of the reception quality of a signal in the opposed transport apparatus 7 (receiving side) (S404). More specifically, the monitor unit 72 of the transport apparatus 7 transmits, to each of the plurality of light transmission/reception units 70, an opposed error count read command for requesting them to send the reception quality notification.
  • the transport apparatus 7 receives the notification of the reception quality of a signal from the opposed transport apparatus 7 (S405). More specifically, the transport apparatus 7 receives an opposed error count from the opposed transport apparatus 7 as the value of the reception quality.
  • the transport apparatus 7 compares the notified value of the reception quality with a predetermined threshold (S406).
  • the monitor unit 72 of the transport apparatus 7 determines, as a target for automatic pre-emphasis control, the light transmission/reception unit 70 having sent this reception quality and sends an output set value read command to the determined light transmission/reception unit 70 (S407).
  • the output set value read command is used to read the set value of the intensity (power) of a signal to be transmitted.
  • the transport apparatus 7 Upon the end of automatic pre-emphasis control, the transport apparatus 7 ends compensation of the intensity (power) of a signal using dummy light (S412). More specifically, the monitor unit 72 of the transport apparatus 7 sends a command to stop constant output control to the light multiplex/demultiplex unit 71 upon the end of automatic pre-emphasis control. The light multiplex/demultiplex unit 71 ends compensation of the intensity (power) of a signal using dummy light and notifies the monitor unit 72 to that effect.
  • Fig. 16 is a sequence chart illustrating another exemplary operation of the transport apparatus according to the third exemplary embodiment of the present invention when OADM Fault Recovery shown in Fig. 15 is executed. It should be noted that the process in each step illustrated in Fig. 16 is the same as the process in each step illustrated in Fig. 15 .
  • the third exemplary embodiment of the present invention combines the methods (means) described in the above-mentioned first and second exemplary embodiments of the present invention to provide a function of ensuring a given communication quality by compensating the intensity (power) of a signal surviving after trouble occurs in the transport channel 3. Therefore, according to the third exemplary embodiment of the present invention, each of a plurality of transport apparatuses (transmitting stations) can further improve the effectiveness of compensation of a signal using dummy light.
  • a transport apparatus 100 includes a transmission unit 70' corresponding to the light transmission/reception unit 70 in each of the above-mentioned exemplary embodiments, as illustrated in Fig. 17 . Further, the transport apparatus 100 includes a generation unit 711 which generates dummy light, and a combination unit 710 which combines signals with each other.
  • the transmission unit 70' transmits a first signal.
  • the generation unit 711 generates a dummy signal for compensating the first signal transmitted from the transmission unit 70'.
  • the combination unit 710 combines the first signal with the dummy signal.
  • the generation unit 711 adjusts the intensity of the dummy signal to be generated, to maintain the intensity of a second signal obtained by combining the first signal with the dummy signal constant.
  • the transport apparatus maintains the intensity (power) of a signal (that is, a second signal) compensated using a dummy signal constant.
  • the transport apparatus can reduce the influence that the compensated signal (second signal) exerts on signals from other transport apparatuses.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Claims (10)

  1. Appareil de transport (7, 7-1, 7-2, 7-3, 100) comprenant :
    des moyens de transmission (70) pour transmettre un signal de transmission ;
    des moyens de génération (711) pour générer un signal factice compensant le signal de transmission,
    des moyens de combinaison (710) pour combiner le signal de transmission avec le signal factice,
    l'appareil étant caractérisé par
    des moyens de surveillance (72) pour recevoir des informations concernant la qualité de réception au niveau d'une station opposée pour le signal de transmission transmis à partir des moyens de transmission et pour demander aux moyens de transmission d'ajuster une intensité du signal de transmission sur la base de la qualité de réception, dans lequel
    les moyens de génération sont configurés pour ajuster une intensité du signal factice pour compenser une variation d'intensité du signal de transmission pour maintenir constante une intensité d'un signal multiplexé obtenu en combinant le signal de transmission avec le signal factice.
  2. Appareil de transport selon la revendication 1, comprenant en outre :
    des moyens de mesure (712) pour mesurer l'intensité du signal multiplexé comprenant le signal de transmission et le signal factice,
    dans lequel les moyens de génération sont configurés pour déterminer une intensité du signal factice à générer, pour maintenir constante l'intensité du signal multiplexé mesurée par les moyens de mesure.
  3. Appareil de transport selon la revendication 1 ou 2, dans lequel les moyens de génération sont configurés pour commencer à générer le signal factice un temps prédéterminé après la survenance d'un problème dans le canal de transport configuré pour transporter le signal multiplexé.
  4. Appareil de transport selon la revendication 1 ou 2, dans lequel :
    les moyens de surveillance sont configurés pour envoyer une demande pour générer le signal factice aux moyens de génération,
    les moyens de génération sont configurés pour commencer à générer le signal factice en réponse à la demande provenant des moyens de surveillance.
  5. Appareil de transport selon la revendication 4, dans lequel les moyens de surveillance sont configurés pour demander aux moyens de transmission d'ajuster une intensité du signal de transmission quand une qualité de réception du signal de transmission dans un appareil opposé qui reçoit le signal de transmission est supérieure à un seuil prédéterminé.
  6. Appareil de transport selon la revendication 5,
    dans lequel les moyens de transmission comprennent une pluralité de moyens de transmission, et les moyens de surveillance sont configurés pour demander aux moyens de transmission, qui ont transmis le signal de transmission avec une qualité de réception supérieure au seuil prédéterminé de signaux de transmission transmis à partir de la pluralité de moyens de transmission, d'ajuster une intensité du signal de transmission.
  7. Appareil de transport selon la revendication 5 ou 6,
    dans lequel les moyens de surveillance sont configurés pour continuer à demander aux moyens de transmission d'ajuster une intensité du signal de transmission jusqu'à ce que des qualités de réception de tous les signaux de transmission transmis respectivement à partir de la pluralité de moyens de transmission deviennent inférieures au seuil prédéterminé.
  8. Appareil de transport selon l'une quelconque des revendications 4 à 7, comprenant en outre :
    des moyens de détection de problème (715) pour détecter qu'un problème est survenu dans le canal de transport, sur la base d'une intensité d'un signal reçu,
    dans lequel les moyens de surveillance sont configurés pour demander aux moyens de transmission d'ajuster une intensité du signal de transmission quand les moyens de surveillance reçoivent une notification par les moyens de détection de problème qu'un problème est survenu dans le canal de transport.
  9. Système de transport comprenant une pluralité d'appareils de transport, chaque appareil étant selon la revendication 1.
  10. Procédé de transport comprenant :
    la transmission d'un signal de transmission ;
    la génération d'un signal factice pour compenser le signal de transmission ;
    la combinaison du signal de transmission avec le signal factice,
    le procédé étant caractérisé par :
    la réception d'informations concernant la qualité de réception au niveau d'une station opposée pour le signal de transmission transmis à partir des moyens de transmission,
    la demande d'ajuster une intensité du signal de transmission sur la base de la qualité de réception, et
    l'ajustement d'une intensité du signal factice pour compenser une variation d'intensité du signal de transmission pour maintenir constante une intensité d'un signal multiplexé obtenu en combinant le signal de transmission avec le signal factice.
EP14849592.2A 2013-09-24 2014-09-11 Appareil de transport, système de transport, procédé de transport, et support d'informations sur lequel est mémorisé un programme Active EP3051720B1 (fr)

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JPWO2015045311A1 (ja) 2017-03-09
EP3051720A4 (fr) 2017-06-07
EP3051720A1 (fr) 2016-08-03
JP6387965B2 (ja) 2018-09-12
US20160197696A1 (en) 2016-07-07
CN105814817A (zh) 2016-07-27
WO2015045311A1 (fr) 2015-04-02
CN105814817B (zh) 2019-11-05
US10680738B2 (en) 2020-06-09

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